Is there a good reason not to...
 

... change the vbulletin default tables to use the INNODB storage engine?

I'm writing a mod and i want to use forign key contraints against a couple of tables... for that to work they have to be innodb...

Not for any searchable table like post.

is that saying theres no reason not to?

My thinking on this: on the surface, innoDB seems to be a better engine, however there must be a reason most things (like vb) use myisam... i refuse to believe its all done out of lazyness...

If you want more detail or specifics, this might be a question best addressed to the developers over at vb.com

Searchable tables like the post table must use MyIsam or you would not have the option to use the MySQL Full Text Search.

bit of an annoyance... one of the tables was the thread table.

Guess i have to write code to do it instead... or perhaps use triggers...